Start with a seller-side workspace that imports listing details and lets sellers track inventory, buyer conversations, price changes, sale status, final price, and receipts in one place. Add a comparison workflow that captures relevant active and sold listings so sellers can price inventory without repeatedly browsing marketplace feeds. Where direct integrations are unavailable, fulfill the initial product through seller-forwarded messages, listing links, structured imports, and a browser extension rather than promising unsupported marketplace access.

The signals span several marketplaces and repeatedly describe the same operational friction, suggesting the problem is broader than one product regression. A narrowly scoped workspace can now be tested without building a new marketplace or solving the buyer-and-seller liquidity problem.